the redirect plugin doesn't accept to links with anchors

[alewolf]

Have you read the Contributing Guidelines on issues?

• I have read the Contributing Guidelines on issues.

Prerequisites

• I'm using the latest version of Docusaurus.
• I have tried the npm run clear or yarn clear command.
• I have tried rm -rf node_modules yarn.lock package-lock.json and re-installing packages.
• I have tried creating a repro with https://new.docusaurus.io.
• I have read the console error message carefully (if applicable).

Description

The following configuration will throw an error during the build.

[ERROR] ValidationError: "redirects[1].to" is not a valid pathname. Pathname should start with slash and not contain any domain or query string.

redirects: [
          {
            from: [
              '/pricing',
              '/pricing/',
            ],
            to: '/plugins/pmw/#pricing-section',
          },
        ],

In my opinion anchors should be allowed.

Reproducible demo

No response

Steps to reproduce

Paste this redirect configuration into docusaurus.config.js

redirects: [
          {
            from: [
              '/pricing',
              '/pricing/',
            ],
            to: '/plugins/pmw/#pricing-section',
          },
        ],

Expected behavior

The build should accept to links with anchors.

Actual behavior

The following error is thrown:

[ERROR] ValidationError: "redirects[1].to" is not a valid pathname. Pathname should start with slash and not contain any domain or query string.

Your environment

• Docusaurus version used: 2.4.0
• Environment name and version (e.g. Chrome 89, Node.js 16.4): Chrome 112.0.5615.121
• Operating system and version (e.g. Ubuntu 20.04.2 LTS): OS X 13.3.1

Self-service

• I'd be willing to fix this bug myself.

[Josh-Cena]

Tracked in #6845